Pulsation damper

Abstract

A pulsation damper which is used for damping pressure variations in an oscillating positive-displacement pump connected thereto is provided. The pulsation damper includes an inlet connection element, an outlet connection element and a line connecting the elements whereby these three components are connected to at least two damper chambers inside the pulsation damper, the damper chambers being connected in series inside the damper housing. One section of the line connected to the inlet connection element includes a connection channel to a first damper chamber and is joined to a second damper chamber via an inlet throttle element. The second damping chamber is connected to the outlet connection element via an outlet throttle. Damper elements made of an elastic material are disposed within the damper chambers.

1. A pulsation damper for an oscillating positive-displacement pump, comprising an inlet connection element, an outlet connection element ( 3 ), and a line that connects these elements and is connected to a damping chamber inside the pulsation damper, wherein at least two damping chambers ( 5 ,  5   a ,  6 ,  6   a ) connected in series are provided inside a damper housing ( 4 ), and a line segment connected to the inlet connection element ( 2 ) has a connecting channel to a first damping chamber ( 5 ,  5   a ) as well as being connected, via an inlet throttle element, to a second damping chamber ( 6 ,  6   a ) that is connected with the outlet connection element ( 3 ) via an outlet throttle element, and the inside of each damping chamber ( 5 ,  5   a ,  6 ,  6   a ) is divided by a separating membrane ( 12 ) into a receiving space ( 13 ,  14 ) for a damping element ( 11 ) made of an elastic material and an area ( 15 ,  16 ) that conducts pumping medium. 
   
   
     2. The pulsation damper as recited in  claim 1 , wherein the inside volume of the pumping-medium-conducting area ( 15 ,  16 ) of at least the first damping chamber ( 5 ,  5   a ) corresponds at least to a delivery capacity of a pump stroke. 
   
   
     3. The pulsation damper as recited in  claim 1 , wherein the elastic material used inside the receiving space ( 13 ,  14 ) of the damping chambers ( 5 ,  5   a ,  6 ,  6   a ) for the damping elements ( 11 ) has an approximately linear elastic characteristic. 
   
   
     4. The pulsation damper as recited in  claim 1 , wherein a volume of the damping elements ( 11 ) corresponds to a multiple of the delivery capacity of a pump stroke. 
   
   
     5. The pulsation damper as recited in  claim 1 , wherein each of the separating membranes ( 12 ) in a non-loaded state that limits the pumping-medium-conducting area ( 15 ,  16 ) of the damping chamber ( 5 ,  5   a ,  6 ,  6   a ) is situated at a distance from the damping material ( 11 ). 
   
   
     6. The pulsation damper as recited in  claim 1 , wherein the damping elements ( 11 ) have a filling volume that is greater than a volume of the receiving space ( 13 ,  14 ), limited by the separating membrane ( 12 ) in the non-loaded state, for the damping elements ( 11 ), and the separating membrane ( 12 ) is pre-stressed by the damping elements ( 11 ). 
   
   
     7. The pulsation damper as recited in  claim 1 , wherein the damping elements ( 11 ) of the second damping chamber ( 6 ,  6   a ) are more flexible than are the damping elements of the first damping chamber ( 5 ,  5   a ). 
   
   
     8. The pulsation damper as recited in  claim 1 , further comprising a two-part housing ( 4 ) having a housing head ( 17 ) and a housing lower part ( 18 ), and the separating membrane ( 12 ) is situated in a separating plane between the housing parts as a sealing element. 
   
   
     9. The pulsation damper as recited in  claim 8 , wherein the inlet and outlet connection elements ( 2 ,  3 ), the line which connects the inlet and outlet connection elements ( 2 ,  3 ), the inlet and outlet throttle elements ( 9 ,  10 ), and the pumping-medium-conducting areas ( 15 ,  16 ) of the damping chambers ( 5 ,  5   a ,  6 ,  6   a ) are provided in the housing head ( 17 ), and the receiving spaces ( 13 ,  14 ) for the damping elements ( 11 ) are provided in the housing lower part ( 18 ). 
   
   
     10. The pulsation damper as recited in  claim 1 , wherein the damper housing ( 4 ) has a round construction, and the inlet and outlet connection elements ( 2 ,  3 ) are situated diametrically opposite one another and each have first and second bores ( 7 ,  7   a ) that are directed inward and are generally in alignment, the damping element receiving spaces ( 13 ,  14 ) each extend over approximately half of a housing base surface, and the first bore ( 7 ) connected with the inlet connection element ( 2 ) extends into an area of the second damping chamber ( 6 ,  6   a ) and is connected with both of the damping chambers ( 5 ,  5   a ,  6 ,  6   a ), the second bore ( 7   a ) connected with the outlet connection element ( 3 ) is connected with the second damping chamber ( 6 ,  6   a ) via the outlet throttle element ( 10 ). 
   
   
     11. The pulsation damper as recited in  claim 1 , wherein the first damping chamber ( 5   a ) is situated concentrically around the second damping chamber ( 6   a ), and is generally formed as an annular chamber. 
   
   
     12. The pulsation damper as recited in  claim 1 , wherein the inlet and outlet throttle elements ( 9 ,  10 ) are formed as exchangeable inserts. 
   
   
     13. The pulsation damper as recited in  claim 1 , wherein a volume of the damping elements ( 11 ) corresponds to ten times the delivery capacity of a pump stroke.